Ok, I fixed it (but not sure why this fixed it). I did a compare of files between 7.5 and 7.5.2 and could not find any differences that would account for this issue. So, just on a hunch, I went to control panel and did a "Clear Cache" and viola! Now the media icon is back. I'm sure there is a logical explanation, but I have no idea what it is. I just thought I'd share this little "fix" in case anyone else runs into the same issue.